The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 1978
Filed:
Jan. 28, 1977
Egon Gahler, Hattersheim, DT;
Braun Aktiengesellschaft, Frankfurt am Main, DT;
Abstract
The circuit includes voltage supply terminals for connection to a voltage source and battery connection terminals for connection to a battery to be charged. Circuitry connects the voltage supply terminals to the battery connection terminals for the transmission of a charging voltage and provides a current path for the flow of charging current. A controllable switch is connected to the charging current path and has conductive and non-conductive states. A second controllable switch is connected to the first controllable switch and is operative upon the receipt of a control signal having a predetermined threshold value for changing the state of the first controllable switch. The second controllable switch receives a control signal whose value varies in dependence upon variations in the charging current and/or the charging voltage. Circuitry is provided for changing the threshold value of the second controllable switch in automatic dependence upon changes in the charging current and/or the charging voltage.